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In 2004, the chemists at DENTSPLY Caulk were given a challenge, to first find out why flowable composites couldn’t be bulk-filled without marginal integrity issues, microleakage, post-op sensitivity and the formation of white lines around the restoration. Once they isolated the polymerization stress as the issue, they moved on to finding out how to eradicate it by doing what chemists do – research, experimentation, observation, trial and error and putting in countless hours in...